CPU Tester Tool
Test Processor Speed & Benchmark
Test your processor performance directly in your browser. Measure single-core speed, multi-core throughput, floating-point performance, memory bandwidth, and more.
Watch for performance drops indicating thermal throttling under sustained load.
Measures raw per-core performance. Critical for gaming and single-threaded applications.
Tests all available CPU threads simultaneously for parallel workload performance.
Tests FPU performance. Critical for 3D rendering, physics, scientific computing, and AI/ML.
Tests array/buffer throughput as a proxy for CPU cache and memory controller speed.
Classic integer benchmark: Sieve of Eratosthenes. Measures raw number-crunching speed.
Runs all modules and computes a weighted composite CPU score. The most comprehensive test.
| # | NAME | MODE | SCORE | THREADS | DATE |
|---|---|---|---|---|---|
| No scores yet. Run a benchmark and save! | |||||
About CPU Test Tool
This free online CPU benchmark tests your processor directly in the browser using JavaScript — the same engine powering modern web apps and Node.js. Get reliable, reproducible CPU performance scores without any download or installation. Whether you want to check how your CPU compares before upgrading, validate overclocking stability, or simply satisfy your curiosity about raw processor speed, this tool gives you an instant, detailed answer. If you also want to check your graphics card performance, try our free GPU test — or measure your clicks-per-second with the APM test.
What Does This CPU Test Measure?
Our tool covers six distinct dimensions of CPU performance: Stress Test (sustained load and thermal throttling detection), Single-Core (per-core IPC speed critical for gaming), Multi-Core (parallel thread throughput for content creation), Float-Point (FPU math performance for 3D and AI workloads), Memory Bandwidth (cache and RAM controller speed), and Prime Sieve (classic integer benchmark). Together these give a complete picture of your processor's real-world capability.
| Test Mode | What It Measures | Key Use Cases | Score Range |
|---|---|---|---|
| Stress Test | Sustained load & thermal throttling | Overclocking, cooling validation | 0-150K pts |
| Single-Core | Per-core IPC & clock speed | Gaming, single-threaded apps | 0-100K pts |
| Multi-Core | Parallel thread performance | Rendering, compilation, streaming | 0-400K pts |
| Float-Point | FPU math throughput | 3D, physics, AI/ML workloads | 0-200K pts |
| Memory BW | Cache & memory controller speed | Data-intensive applications | 0-80K pts |
| Prime Sieve | Integer math & branch prediction | Scientific computing | 0-120K pts |
CPU Score Rating Scale
| Score | Rating | Typical Hardware |
|---|---|---|
| 120,000+ | BEAST MODE | Modern flagship (i9/R9/M3 Max) |
| 80,000–120,000 | HIGH-END | i7/R7/M2 Pro class |
| 50,000–80,000 | SOLID | i5/R5/M2/M1 class |
| 25,000–50,000 | MID-RANGE | i3/R3/older laptop CPU |
| 0–25,000 | ENTRY LEVEL | Mobile/low-power CPU |
CPU vs GPU — Understanding Both Benchmarks
The CPU handles logic, physics, AI, game scripting, and single-threaded tasks — it is the brain of your system. The GPU handles parallel rendering, shader computation, and display output. A high CPU score does not guarantee high GPU performance, and vice versa. For a complete picture of your system, run both this CPU benchmark and the GPU test to identify which component is your current bottleneck. Gamers especially benefit from knowing both scores — CPU bottlenecks cause low average FPS and stutters, while GPU bottlenecks reduce maximum frame rate.
Monitor & Display Testing
A fast CPU and GPU are only part of the picture — your monitor's refresh rate and frame delivery consistency also affect perceived smoothness. If you want to check whether your display is rendering at its rated Hz, or detect frame tearing and pacing issues, the free UFO Test visualizes motion smoothness at different refresh rates directly in your browser, no software needed.
Actions Per Minute & Input Performance
For competitive gamers and professionals who care about input speed, keyboard response, and actions-per-minute throughput, your CPU's single-core speed is critical — faster clock speeds reduce input latency. After benchmarking your processor here, measure your own input performance with the APM test, which counts your mouse clicks and keystrokes per minute to give you a quantified measure of your reaction speed and input precision.
FAQ
A CPU benchmark measures your processor by running standardized computational tasks, testing speed, throughput, and consistency. Our tool uses JavaScript as the medium, which is JIT-compiled by your browser and provides a reliable cross-platform measure of CPU capability — no download required.
In the Overall suite, scores above 80,000 indicate a modern high-performance CPU like Intel Core i7 or AMD Ryzen 7. Scores of 40,000–80,000 represent capable mid-range processors. Below 40,000 suggests an older or mobile/low-power chip. Apple Silicon M-series (M1, M2, M3) chips tend to score very high due to their efficient architecture and fast memory subsystem.
A stress test runs intensive computation at maximum load continuously. It reveals thermal throttling — when your CPU automatically reduces its clock speed to prevent overheating. If your benchmark score drops significantly after the first few seconds of the stress test, your cooling solution may be insufficient for sustained workloads such as video rendering or gaming sessions.
Score variation is caused by background OS tasks, browser garbage collection pauses, thermal throttling, and battery saver mode on laptops. For the most consistent results: close other browser tabs and background applications, keep your device plugged in, select "Precise" mode in the benchmark, and run the test 2–3 times to find your average peak score.
Multi-core performance measures how well a processor utilizes all its cores simultaneously. Modern CPUs range from 4 to 32+ cores. High multi-core scores are critical for video encoding, 3D rendering, software compilation, live game streaming, and AI/ML inference. Single-core scores remain more important for gaming responsiveness and general desktop snappiness.
Browser-based benchmarks measure JavaScript engine performance, which is an excellent proxy for real-world CPU capability since modern JS engines use JIT compilation. Results are highly consistent within the same browser. Scores may differ between Chrome (V8) and Firefox (SpiderMonkey) due to different JIT optimizations. While they differ from native tools like Cinebench or Prime95, they are reliable for comparing CPUs and tracking performance over time.
For a complete system performance profile, consider testing your GPU, checking your monitor refresh rate, and measuring your input speed — together these give you a comprehensive view of your entire system from processor to display.